Opaque polyester-based materials
AssigneeHolland Colours N.V.
InventorsJohan Jozef Marinus Werink, Johannes Henricus Hurenkamp, Jules Caspar Albert Anton Roelofs
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Abstract
The invention discloses a preform for a container comprising a polyester, titanium dioxide, and a light absorbing additive. In addition, a process for preparing a polyester-based container from such a preform is disclosed, as well as a polyester-based container obtainable by such a process. The opaque containers can for instance be used for storing light-sensitive solids and/or liquids. The optical properties of the preform result in improved properties during blow-moulding processes.
Claims22
A preform for a container, said preform comprising:
- a polyester in an amount of 80% or more by total weight of the preform,
- titanium dioxide pigment in an amount of 0.5% or more by total weight of the preform,
- a light absorbing additive;
- wherein said preform has a transmittance at 550 nm of 0.1% or less and a transmittance at 1300 nm of 0.5% or more,
- wherein the transmittance is measured at 2 mm sample thickness and the transmittance is determined from transmission curves collected using a spectrometer equipped with an integrating sphere.
A preform for a container, said preform comprising:
- a polyester in an amount of 80% or more by total weight of the preform,
- titanium dioxide pigment in an amount of 0.5% or more by total weight of the preform,
- a light absorbing additive;
- wherein said preform has an absorption (%) at 550 nm of 25% or more and an absorption (%) at 1300 nm of 20% or less, wherein the absorption (%) is measured at 2 mm sample thickness,
- wherein absorption (%)=100%−transmittance (%)−reflection (%),
- wherein reflection refers to the percentage of light that is reflected by the sample, and
- wherein transmission and reflection are determined from transmission curves collected using a spectrometer equipped with an integrating sphere.
Dependencies are inferred from the claim text.